How can I identify the fuse related to battery-powered auxiliary items?

Fuse 19 with a nominal value of 5A is dedicated for functions including ignition/starter switch and onboard supply control unit (T73a/42) that support various vehicle operations. (Page 2)

From the official Volkswagen Polo 2009 2017 Fuses And Fuse Box Diagram And Location manual, page 2

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